TW201829207A - Light irradiation device capable of obtaining ultraviolet light of a specific intensity without changing the irradiation intensity or irradiation time even if the size of the object to be irradiated is changed - Google Patents

Abstract

This invention relates to a light irradiation device, even if the size of the object to be irradiated is changed, capable of obtaining an ultraviolet light of a specific intensity on the outer periphery surface of an object to be irradiated without changing the irradiation intensity or irradiation time. A stereoscopic illumination object can rotate with respect to a central axis extending in the first direction and have a different dimension in a second direction orthogonal to the first direction; and a light irradiation device disposed in the second direction irradiating the outer peripheral surface of the object to be irradiated with ultraviolet light from the second direction includes a plurality of LED elements that are arranged on the substrate in the first direction and irradiated with ultraviolet light with respect to the object to be irradiated;; and a spotlight unit disposed in the optical path of the plurality of LED elements refracts or reflects the ultraviolet light emitted from each of the LED elements, and emits the concentrated light toward the central axis.

Description

Light irradiation device

The present invention relates to a light irradiation device that uses an LED (Light Emitting Diode) as a light source and irradiates ultraviolet light to a three-dimensional irradiation object rotating around a central axis.

Currently, as inks for printing containers such as beer / juice cans / plastic bottles, shampoos, and cosmetic bottles, ultraviolet-curable inks that are cured by irradiation with ultraviolet light are used. When curing such an ultraviolet curable ink, an ultraviolet light irradiation device that irradiates ultraviolet light is generally used.

For example, Patent Document 1 describes an image forming apparatus that uses an ink jet head to form an image on the outer peripheral surface of a tank (irradiation target). This device includes a support cylinder (mandrel) inserted into the tank body to support the tank body, an ink jet head that ejects ultraviolet curable ink to the outer peripheral surface of the tank body supported by the support cylinder, a UVLED lamp, and the like. Further, the device of Patent Document 1 ejects ultraviolet curable ink while rotating the can body to form an image on the outer peripheral surface of the can body, and irradiates the outer peripheral surface of the can body with ultraviolet light from a UV LED lamp, thereby making The UV-curable ink adhered to the outer peripheral surface of the can body is cured. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2016-013548

[Problems to be Solved by the Invention]

According to the structure of Patent Document 1, the UV-curable ink adhered to the outer peripheral surface of the can body can be cured by a UVLED lamp arranged in parallel with the central axis of the can body. However, since the UVLED lamp is fixed at a certain distance from the support tube (that is, the outer peripheral surface of the tank body), if the size (diameter) of the tank body is different, the working distance (the outer peripheral surface of the tank body and the UVLED lamp) Distance) will change, and the intensity of ultraviolet light irradiation on the outer surface of the tank will also change. Therefore, there is a problem that if you want to deal with a variety of tanks, you must change the UV according to the size of the tank. The irradiation intensity of light, or the irradiation time must be changed. In addition, there is a problem that a preparation time is required to change the irradiation intensity or irradiation time of the ultraviolet light.

The present invention has been made in view of this situation, and an object of the present invention is to provide a light irradiation device that allows the outer peripheral surface of an irradiation target to be specified without changing the irradiation intensity or irradiation time even if the size of the irradiation target changes. Intensity of ultraviolet light. [Means for solving problems]

In order to achieve the above-mentioned object, the light irradiation device of the present invention is arranged with three-dimensional irradiation objects having different sizes in a second direction orthogonal to the first direction while rotating around a central axis extending in the first direction. Ultraviolet light is irradiated to the outer peripheral surface of the irradiation object from the second direction, the light irradiation device includes: a plurality of LED elements arranged on the substrate in the first direction and irradiating the ultraviolet light with respect to the irradiation object; and The light condensing unit is disposed in the optical paths of the plurality of LED elements, refracts or reflects the ultraviolet light emitted from each LED element, and emits the convergent light toward the central axis.

According to this structure, even if the size (size in the second direction) of the irradiation target is changed, the ultraviolet light is surely incident on the outer peripheral surface of the irradiation target, so that ultraviolet light having a specific intensity is obtained on the outer peripheral surface of the irradiation target.

In addition, it is preferable that the condensing unit is a mirror having a reflecting surface that condenses light toward a central axis. In this case, the reflecting surface is preferably a curved surface including an ellipse or a paraboloid.

In addition, preferably, the light condensing unit is a cylindrical lens extending in the first direction, and is arranged such that when viewed from the first direction, the optical axes of the plurality of LED elements and the optical axes of the cylindrical lenses face the center direction of the object to be irradiated.

In addition, preferably, the condensing unit condenses the ultraviolet light toward the central axis.

In addition, from another viewpoint, the light irradiation device of the present invention has three-dimensional irradiation with a different size in a second direction that is rotated about a central axis extending in the first direction and is orthogonal to the first direction. The object is arranged in a second direction, and the outer peripheral surface of the irradiation object is irradiated with ultraviolet light from the second direction. The light irradiation device includes: N light source units having a substrate, and the substrate is arranged along the first direction on the substrate and is opposite to the irradiation. A plurality of LED elements irradiated with ultraviolet light by the object, N is an integer greater than or equal to 1; and N optical elements are arranged in the optical paths of the plurality of LED elements, and the ultraviolet light emitted from each LED element is shaped so that Light having a specific line width when viewed in one direction, wherein when viewed from the first direction, the optical axis of the plurality of LED elements and the optical axis of the optical element face the center direction of the object to be illuminated, and the specific line width is set to It is smaller than the diameter of the irradiation object. In this case, it is preferable that the optical axis of the plurality of LED elements and the optical axis of the optical element pass through the central axis when viewed from the first direction.

In this case, preferably, N is greater than or equal to 2, and when viewed from the first direction, the N light source units and the N optical elements are arranged on an arc centered on the central axis.

In addition, preferably, the optical element is a cylindrical lens extending in the first direction.

In addition, from another viewpoint, the light irradiation device of the present invention has three-dimensional irradiation with a different size in a second direction that is rotated about a central axis extending in the first direction and is orthogonal to the first direction. The object is arranged in the second direction, and the outer peripheral surface of the irradiation object is irradiated with ultraviolet light from the second direction. The light irradiation device includes a plurality of LED elements arranged on the substrate in the first direction and facing the object to be irradiated. Irradiate ultraviolet light; a pair of light guide mirrors configured to sandwich the optical paths of a plurality of LED elements from a third party orthogonal to the first direction and the second direction, and guide the ultraviolet light with respect to the irradiation target And a moving unit that moves the plurality of LED elements and the pair of light guide mirrors in the second direction in accordance with the diameter of the irradiation target.

In this case, it is preferable that the optical axes of the plurality of LED elements pass through the central axis when viewed from the first direction.

In addition, it is preferable that the interval between the pair of light guide mirrors is set smaller than the diameter of the irradiation target. [Effect of the invention]

As described above, according to the light irradiation device of the present invention, even if the size of the irradiation target is changed, it is possible to obtain ultraviolet light of a specific intensity on the outer peripheral surface of the irradiation target without changing the irradiation intensity or irradiation time.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same or corresponding parts in the drawings are denoted by the same reference numerals, and descriptions thereof will be omitted. (First Embodiment)

FIG. 1 is a perspective view showing a configuration of a light irradiation system 1 using a light irradiation device 10 according to a first embodiment of the present invention. As shown in FIG. 1, the light irradiation system 1 is a system for curing an ultraviolet curable ink applied on the surface of the irradiation target P, and includes a support tube inserted into the irradiation target P and supporting the irradiation target P. (Mandrel) 50 and a light irradiation device 10 that irradiates linear ultraviolet light to the outer peripheral surface of the irradiation target P. The support cylinder 50 is rotated in a clockwise direction by a motor (not shown), and with the rotation of the support cylinder 50, the irradiation target P attached to the front end of the support cylinder 50 is rotated. In addition, as shown in FIG. 1, in the present embodiment, for convenience of explanation, the irradiation target object P is formed into a substantially cylindrical shape, and the rotation center of the irradiation target object P will be described as the central axis AX. In addition, in the following description, the long-side (line-length) direction of the linear ultraviolet light emitted from the light irradiation device 10 is defined as the X-axis direction, and the short-side direction is defined as the Y-axis direction. A direction in which the axes are orthogonal is defined as the Z-axis and described. The ultraviolet light generally refers to light having a wavelength of 400 nm or less, but in this specification, the ultraviolet light refers to light having a wavelength (for example, a wavelength of 250 to 420 nm) that can cure an ultraviolet curable ink.

As shown in FIG. 1, the light irradiation device 10 according to this embodiment includes a base 11, a light source unit 12, an elliptical mirror 14, and a housing (not shown) for accommodating the base 11, the light source unit 12, and the elliptical mirror 14. Show) and so on.

The base 11 is a metal plate-shaped member that is parallel to the X-axis direction and the Y-axis direction. The base 11 is disposed in close contact with the back surface of the substrate 12 a of the light source unit 12, and supports the light source unit 12. A component called a heat sink that dissipates the generated heat.

FIG. 2 is a front view of the light source unit 12 (a view viewed from the positive direction side of the Z axis). As shown in FIG. 2, the light source unit 12 includes a rectangular substrate 12 a parallel to the X-axis direction and the Y-axis direction, and a plurality of LED elements 12 b arranged on the substrate 12 a.

The substrate 12 a is a rectangular wiring substrate formed of a material having high thermal conductivity (for example, aluminum nitride). As shown in FIG. 2, the surface of the substrate 12 a is a COB (Chip On Board) at a specific pitch (for example, 3.0 mm) along the X axis direction. ) Place 10 LED elements 12b. On the substrate 12a, an anode pattern (not shown) and a cathode pattern (not shown) for supplying power to each LED element 12b are formed, and each LED element 12b is electrically connected to the anode pattern and the cathode pattern, respectively. In addition, the substrate 12a is electrically connected to a driving circuit (not shown) by a wiring cable (not shown), and a driving current is supplied from the driving circuit to each LED element 12b via an anode pattern and a cathode pattern. When a driving current is supplied to each LED element 12b, ultraviolet light (for example, a wavelength of 365 nm) of a light amount corresponding to the driving current is emitted from each LED element 12b, and linear ultraviolet light parallel to the X-axis direction is emitted from the light source unit 12.

When power is supplied to the light source unit 12 and ultraviolet light is emitted from each of the LED elements 12b, the temperature of the LED elements 12b increases due to the self-heating of the LED elements 12b. This causes a problem that the luminous efficiency is significantly lowered. Since the light source unit 12 is cooled, the occurrence of such a problem is suppressed.

The elliptical mirror 14 is a metal member that reflects ultraviolet light from the light source unit 12 and is mounted in a housing (not shown) so as to cover the light source unit 12 from the positive direction side of the Z axis ( figure 1). A surface of the elliptical mirror 14 opposite to the light source unit 12 is coated with a light reflective material such as a metal thin film to form a reflective surface 14a. The reflection surface 14a of the elliptical mirror 14 according to this embodiment is an elliptical surface extending in the X-axis direction. When viewed from the X-axis direction, each LED element 12b of the light source unit 12 is arranged at its first focal position.

FIG. 3 is a light ray diagram explaining ultraviolet light irradiated from the light irradiation device 10 according to the present embodiment to the irradiation target P. In addition, in FIG. 3, P1 represents the irradiation object P having the smallest size (for example, a diameter of 20 mm), and P2 represents the irradiation object P having the largest size (for example, a diameter of 60 mm).

As shown in FIG. 3, in the present embodiment, the central axis AX of the irradiation target P is arranged at the second focal position of the elliptical mirror 14, and ultraviolet light (each light) emitted from the light source unit 12 is directed toward the irradiation target. The central axis AX of the object P condenses light. Therefore, whether the size of the irradiation target P is small (P1) or the size of the irradiation target P is large (P2), the ultraviolet light emitted from the light source unit 12 is surely incident on the irradiation target. The outer peripheral surface of the object P. Therefore, even if the size of the irradiation target P is changed, ultraviolet light of a specific intensity can be obtained on the outer peripheral surface of the irradiation target P. That is, according to the configuration of this embodiment, it is not necessary to change the irradiation intensity or irradiation time each time the size of the irradiation target P is changed. In other words, according to the present invention, even if the size (diameter or radius) of the irradiation target P rotated around the central axis AX is changed, the outer peripheral surface of the irradiation target P can be irradiated with a specific intensity of ultraviolet light.

The above is the description of the present embodiment, but the present invention is not limited to the above-mentioned structure, and various modifications can be made within the scope of the technical idea of the present invention.

For example, a package lens of a hemispherical shape or a cannonball shape may be disposed on each of the LED elements 12b in this embodiment. According to this configuration, since the spreading angle of the ultraviolet light emitted from each LED element 12b can be narrowed, the size of the elliptical mirror 14 can be reduced.

In addition, in the present embodiment, it has been described that the central axis AX of the irradiation target object P is arranged at the second focal position of the elliptical mirror 14, and the ultraviolet light (each light) emitted from the light source unit 12 is directed toward the center of the irradiation target object P. The axis AX condenses light, but it is not necessarily limited to this structure. As long as the elliptical mirror 14 has a reflecting surface for condensing light toward the central axis AX, a parabolic mirror having a parabolic mirror may be used instead of the elliptical mirror 14. (Second Embodiment)

4 is a diagram illustrating a configuration of a light irradiation system 1A using a light irradiation device 10A according to a second embodiment of the present invention, and is a light ray diagram when the light irradiation device 10A according to the present embodiment is viewed from the X-axis direction. As shown in FIG. 4, the light irradiation device 10A according to this embodiment is different from the light irradiation device 10 according to the first embodiment in that the light source unit 12 is mounted downward (toward the negative direction side of the Y axis) instead of an ellipse The reflecting mirror 14 includes a condenser lens 15. The condenser lens 15 is fixed in a housing (not shown) by a fixing member (not shown).

The condenser lens 15 is an optical component for condensing the ultraviolet light from the light source unit 12 toward the central axis AX of the irradiation target P, and is arranged in the optical path of the LED element 12b. The condenser lens 15 of this embodiment is an optical glass or a lenticular cylindrical lens made of silicon extending in the X-axis direction. When viewed from the X-axis direction, the condenser lens 15 is arranged as the optical axis of the LED element 12 b and the optical axis of the condenser lens 15. It passes through the central axis AX of the irradiation target P, and is configured to refract ultraviolet light (each light) emitted from the LED element 12 b in the Z-axis direction, and condenses the central axis AX of the irradiation target P. Therefore, whether the size of the irradiation target P is small (P1) or the size of the irradiation target P is large (P2), the ultraviolet light emitted from the light source unit 12 is surely incident on the irradiation target. The peripheral surface of P. Therefore, even if the size of the irradiation target P is changed, ultraviolet light of a specific intensity can be obtained on the outer peripheral surface of the irradiation target P. That is, according to the configuration of the present embodiment, it is not necessary to change the irradiation intensity or irradiation time each time the size of the irradiation target P is changed. In addition, in this embodiment, the optical axis of the LED element 12b and the optical axis of the condenser lens 15 pass through the central axis AX of the irradiation target P, but it is not necessarily limited to this structure, as long as it is configured so that the LED element 12b The optical axis of the optical axis and the optical axis of the condenser lens 15 may be directed toward the center direction of the irradiation target P. (Third Embodiment)

FIG. 5 is a diagram illustrating a configuration of a light irradiation system 1B using a light irradiation device 10B according to a third embodiment of the present invention, and is a light ray diagram when the light irradiation device 10B of the present embodiment is viewed from the X-axis direction. As shown in FIG. 5, the light irradiation device 10B according to this embodiment is different from the light irradiation device 10A according to the second embodiment in that it has three light source units 12 and three condenser lenses 15B, and is configured so that The ultraviolet light emitted from each condenser lens 15B becomes substantially parallel light.

The condenser lens 15B is an optical component for shaping the ultraviolet light from the light source unit 12 into substantially parallel light, and is arranged in the optical path of the LED element 12 b of each light source unit 12. The condenser lens 15B of the present embodiment is an optical glass or a lenticular cylindrical lens made of silicon extending in the X-axis direction. When viewed from the X-axis direction, the condenser lens 15B is arranged as the optical axis of the LED element 12b and the optical axis of the condenser lens 15B The light passes through the central axis AX of the irradiation object P, refracts the ultraviolet light (each light) emitted from the LED element 12b in the Z-axis direction, and is shaped into substantially parallel light having a specific line width.

As shown in FIG. 5, the three light source units 12 and the three condenser lenses 15B according to this embodiment are arranged on an arc centered on the central axis AX of the irradiation target P, and are arranged so that The main ray of the emitted ultraviolet light (light having an expansion angle of 0 °) condenses toward the central axis AX of the irradiation target P. In addition, the line width d of the ultraviolet light emitted from each condenser lens 15B is sufficiently smaller than the diameter of the irradiation target object P1 having the smallest size, and is configured so that the ultraviolet light emitted from each light source unit 12 is directed toward the irradiation target object P. The outer peripheral surface is surely incident. That is, whether the size of the irradiation target P is small (P1) or the size of the irradiation target P is large (P2), the ultraviolet light emitted from each light source unit 12 is surely incident on the irradiation target. The outer peripheral surface of the object P. Therefore, even if the size of the irradiation target P is changed, ultraviolet light of a specific intensity can be obtained on the outer peripheral surface of the irradiation target P. That is, according to the configuration of this embodiment, when changing the size of the irradiation target P, it is not necessary to change the irradiation intensity or irradiation time.

In addition, in the present embodiment, the light irradiation device 10B includes three light source units 12 and three condenser lenses 15B. However, the number of the light source units 12 and the condenser lenses 15B is not limited to this. The irradiation intensity required for curing the UV-curable ink applied on the outer peripheral surface of the object P is appropriately changed (that is, the structure using N light sources 12 and N is an integer greater than or equal to 1) and the condenser lens 15B. In addition, in this embodiment, the optical axis of the LED element 12b and the optical axis of the condenser lens 15B pass through the central axis AX of the irradiation object P, but it is not necessarily limited to this structure, as long as it is configured as the LED element 12b The optical axis and the optical axis of the condenser lens 15B may be directed toward the center direction of the irradiation target P. The ultraviolet light emitted from the condenser lens 15B is not necessarily limited to substantially parallel light. (Fourth Embodiment)

FIG. 6 is a diagram illustrating a configuration of a light irradiation system 1C using a light irradiation device 10C according to a fourth embodiment of the present invention, and is a light ray diagram when the light irradiation device 10C of this embodiment is viewed from the X-axis direction. As shown in FIG. 6, the light irradiation system 1C according to this embodiment is different from the light irradiation system 1 according to the first embodiment in that it has a lifting mechanism that raises and lowers the light irradiation device 10C according to the size (diameter) of the irradiation object P. 20, FIG. 6 (a) shows a state where the light irradiation device 10C is arranged close to the irradiation target object P1 having the smallest size, and FIG. 6 (b) shows a state where the light irradiation device 10C is arranged close to the irradiation object P2 having the largest size. status. The light irradiation device 10C of this embodiment is different from the light irradiation device 10 of the first embodiment in that the light source unit 12 is mounted downward (toward the negative direction side of the Y-axis) instead of the elliptical mirror 14. It has a pair of light guide mirrors 17. In addition, a known mechanism such as a slide can be used for the lifting mechanism 20, but in FIG. 6, the lifting mechanism 20 is simply shown in a block for convenience of explanation.

The pair of light guide mirrors 17 is an optical member for guiding the ultraviolet light from the light source unit 12 toward the outer peripheral surface of the irradiation target P. The light guide mirror 17 is arranged to sandwich the LED element 12b in the Z-axis direction. Light path. The pair of light guide mirrors 17 according to the present embodiment are parallel flat mirrors that extend in the X axis direction in parallel in the X axis direction with an interval p in the Z axis direction. Surface) with a reflective surface.

As shown in FIG. 6 (a), when the irradiation target object P1 having the smallest size is irradiated, the light source unit 12 moves to a position close to the outer peripheral surface of the irradiation target object P1 and is arranged to cause ultraviolet light emitted from the light source unit 12 The main ray (the ray with an extension angle of 0 °) passes through the central axis AX of the irradiation object P. In addition, the interval p between the pair of light guide mirrors 17 is set to be sufficiently smaller than the diameter of the irradiation target object P1, and is configured so that the ultraviolet light emitted from the light source unit 12 is incident on the outer peripheral surface of the irradiation target object P1 surely.

In addition, as shown in FIG. 6 (b), when the irradiation target object P2 having the largest size is irradiated, the light source unit 12 moves to a position close to the outer peripheral surface of the irradiation target object P2 and is disposed so that the light emitted from the light source unit 12 is emitted. The main ray of the ultraviolet light (light having an extension angle of 0 °) passes through the central axis AX of the irradiation target P. As described above, since the interval p between the pair of light guide mirrors 17 is set to be sufficiently smaller than the diameter of the irradiation target object P1, when the irradiation target object P2 having the largest size is irradiated, the light emitted from the light source unit 12 is emitted. Ultraviolet light is also incident on the outer peripheral surface of the irradiation target P2 with certainty.

Therefore, also in the configuration of this embodiment, similarly to the first to third embodiments, even when the size of the irradiation target P is small (P1), or when the size of the irradiation target P is large. Below (P2), all the ultraviolet light emitted from the light source unit 12 is surely incident on the outer peripheral surface of the irradiation target P. Therefore, even if the size of the irradiation target P is changed, ultraviolet light of a specific intensity can be obtained on the outer peripheral surface of the irradiation target P. That is, according to the configuration of the present embodiment, it is not necessary to change the irradiation intensity or irradiation time each time the size of the irradiation target P is changed.

In addition, the embodiments disclosed this time are all examples and should not be considered as limiting. The scope of the present invention is not shown by the above description, but is shown by the scope of patent application, and its meaning is to include all meanings within the meaning and scope equivalent to the scope of patent application.

1.1A, 1B, 1C‧‧‧‧light irradiation system

10, 10A, 10B, 10C‧‧‧ light irradiation device

11‧‧‧ abutment

12‧‧‧light source unit

12a‧‧‧ substrate

12b‧‧‧LED components

14‧‧‧ Elliptical Mirror

14a‧‧‧Reflective surface

15, 15B‧‧‧ condenser lens

17‧‧‧light guide mirror

20‧‧‧Lifting mechanism

50‧‧‧ support tube

AX‧‧‧Center axis

P, P1, P2 ‧‧‧ irradiation target

p‧‧‧ interval

FIG. 1 is a perspective view showing a configuration of a light irradiation system using a light irradiation device according to a first embodiment of the present invention. FIG. 2 is a front view illustrating a configuration of a light source unit included in the light irradiation device according to the first embodiment of the present invention. FIG. 3 is a light ray diagram illustrating ultraviolet light irradiated from a light irradiation device according to the first embodiment of the present invention to an irradiation target. FIG. 4 is a diagram illustrating a configuration of a light irradiation system using a light irradiation device according to a second embodiment of the present invention. FIG. 5 is a diagram illustrating a configuration of a light irradiation system using a light irradiation device according to a third embodiment of the present invention. FIG. 6 is a diagram illustrating a configuration of a light irradiation system using a light irradiation device according to a fourth embodiment of the present invention.

Claims (12)

A light irradiating device is disposed on the second three-dimensional irradiation object having different sizes in a second direction that is rotated about a central axis extending in a first direction and is orthogonal to the first direction. A direction for irradiating ultraviolet light to the outer peripheral surface of the irradiation object from the second direction, comprising: a plurality of LED elements arranged on the substrate in the first direction, and irradiating the ultraviolet light with respect to the irradiation object Light; and a light condensing unit, which is arranged in the optical paths of the plurality of LED elements, refracts or reflects the ultraviolet light emitted from the LED elements, and emits convergent light toward the central axis. The light irradiation device according to item 1 of the scope of the patent application, wherein the light condensing unit has a reflecting mirror that reflects light toward the central axis. The light irradiation device according to item 2 of the scope of patent application, wherein the reflecting surface includes an ellipse or a parabolic curved surface. The light irradiation device according to item 1 of the scope of patent application, wherein the light condensing unit is a cylindrical lens extending in the first direction, and the plurality of LEDs are configured when viewed from the first direction. The optical axis of the element and the optical axis of the cylindrical lens face the center direction of the irradiation target. The light irradiation device according to any one of claims 1 to 4 in the scope of the patent application, wherein the light focusing unit focuses the ultraviolet light toward the central axis. A light irradiating device is disposed on the second three-dimensional irradiation object having different sizes in a second direction that is rotated about a central axis extending in a first direction and is orthogonal to the first direction. Direction, irradiating ultraviolet light to the outer peripheral surface of the irradiation object from the second direction, including: N light source units, including a substrate, and disposed on the substrate in the first direction and opposite to the irradiation object A plurality of LED elements that irradiate the ultraviolet light, wherein N is an integer greater than or equal to 1; and N optical elements are arranged in the optical paths of the plurality of LED elements and emit light from the LED elements. The ultraviolet light shaping is light having a specific line width when viewed from the first direction; wherein, when viewed from the first direction, the optical axes of the plurality of LED elements and the optical axis of the optical element are configured. An optical axis is directed toward a center direction of the irradiation object, and the specific line width is set to be smaller than a diameter of the irradiation object. The light irradiation device according to item 6 of the scope of patent application, wherein when viewed from the first direction, the optical axis of the plurality of LED elements and the optical axis of the optical element pass through the central axis. The light irradiation device according to item 6 or item 7 of the patent application scope, wherein the N is greater than or equal to 2, and when viewed from the first direction, the N light source units and the N optical elements It is arranged on an arc centered on the central axis. The light irradiation device according to any one of claims 6 to 8 in the scope of the patent application, wherein the optical element is a cylindrical lens extending in the first direction. A light irradiating device is disposed on the second three-dimensional irradiation object having different sizes in a second direction that is rotated about a central axis extending in a first direction and is orthogonal to the first direction. A direction for irradiating ultraviolet light to the outer peripheral surface of the irradiation object from the second direction, comprising: a plurality of LED elements arranged on the substrate in the first direction, and irradiating the ultraviolet light with respect to the irradiation object Light; a pair of light-guiding mirrors configured to sandwich the optical paths of the plurality of LED elements from a third party orthogonal to the first direction and the second direction, and opposite to the irradiation target Light-guiding the ultraviolet light; and a moving unit that moves the plurality of LED elements and the pair of light-guiding mirrors in the second direction corresponding to a diameter of the irradiation target. The light irradiation device according to item 10 of the scope of patent application, wherein when viewed from the first direction, the optical axes of the plurality of LED elements pass through the central axis. The light irradiation device according to item 10 of the application, wherein an interval between the pair of light guide mirrors is set smaller than a diameter of the irradiation target.